Eraser for ink, pigments, and the like.



FIH. BALDWIN & W. 'GRAFF. ERASER FOE INK, PIGMBNTS, AND THE LIKE.

APPLICATION FILED JUNE 30, 1910.

Patented Oct. 17, 1911.

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FRANCIS HENRY BALDWIN AND WILLIAM GRAFF, OF NEW YORK, N. Y.; SAID GRAFFASSIGNOR T SAID BALDWIN.

EEASER FOR INK, PIGMENTS, AND THE LIKE.

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Specification of Letters Patent.

Patented Got. 17, 1911.

Application filed JuneBO, 191d. Serial No. 589,738.

To all whom it may concern:

.Be it known that we, FRANCIS HENRY BALDWIN, a resident of the boroughof Manhattan, New York city, and VILLIAM. GRAFF, a resident of Brooklyn,New York city, have invented certain new and useful Improvements inErasers ;for Ink, Pigments, and the Like, of which the following is aspecification, accompanied by drawings.

The invention relates to erasers for me chanically erasing ink, pigmentsand the lil-ccffroni paper, parchment, and other ma terials, and itsobject is to provide an eraser which shall he efiicieut in service andin which preferably the part that takes the wear can be removed at smallcost.

The details of the invention will he readily understood from adescription of the acconu ianying drawings which illustrate ourpreferred embodiment of it though we, of course, do not wish to berestricted to the preferred details described.

.Figure l. is a side View of the complete eraser. Fi 2 is a central lonitudinal section showing some of the parts, however, in full. Fig. 8 isa view of the spun glass brush; and Fig. 4c is a front end-vicw of theeraser. v

At 10 is shown a spun glass brush or bundle of spun glass fibers securedby being glued into a round socket orcap 11. "his spun glass brush, asit is worn out and discarded in use, is designed to be replaced by newbrushes which are readily manufactured at very small cost. Such glassbrush, owing to the hardness and brittleness of the glass, has to becarefully protected and supported at its wearing end. For this reasonmeans are provided for supporting and advancing the brush within aconverging moutlu'iiece 12 through which the brush-1s protruded slightlyfor use, as seen in Figs. 1 and 2. Although the brush is preferablyround, this mouthpiece has a rectangular mouth, the cross section ofwhich is des igncd to snugly accommodate the protruding end of the brushwhile supporting and holding the individual glass fibers tightlytogether. The angular shape of the mouth enables the angular corners ofthe protruding brush end to be used for scratching out fine lines. Thewhole end of thebrush can he used to scratch out and erase larger areas.

, The mouthpiece 12 is'preferahly of thin metal and is round at its baseor open end and screw-threaded onto a barrel or hollow shaft 14,preferably of wood, the internal diameter of which approximately fitsand acts a guideway for the brush socket 11. The rear end of the barrel14 is provided with a screw-threaded metal cap 15 which is. crimped orpinchedonto the barrel 14, or otherwise secured thereto, and receivesthe screw-threaded follower rod 16, the forwardend ofwhich looselyengages the cap 11 for advancing the brush into the convergingmouthpiece 12 to adjust and advance the brush from time to time as itsexposed end is worn away. The screw rod lb is provided with a cap 17secured to it. and by which it- .may he turned to screw it into and outof the nut cap 15. This cap 1? is preferably provided on its exteriorsurface with roughened or cut surface 18 for more easily turning it toscrew in the rod 16. (lap 17 covers the rear end of the barrel 14-, asshown. As the brush wears down and is advanced by screwin in the rod 16,the

@ap advances over the )arrel 14. v

To remove or insert the brush, the mouthpiece 12 is unscrewed, allowingthe old brush to be withdrawn and. a new one inserted, the screw 16being retracted sutliciently to admit the length of thenew brush withinthe mouthpiece. When a now brush has been put in place and themouthpiece l2 screwed or secured in place, the cap 17 is turned untilthe rod [(3 pushing on the brush socket l1 advances the brush andprotrudes it through the moutl-ipiccc to the dcsirod extent. The forwardcud of the brush iii being thrust into the mouthpime, meets theoonvcrgin surface and is pressed into the angular sliape of the mouth asit reaches and protrudes through it. The spun glass fibers arcpreferably as fine as fine hair, and

it is desirable, therefore, that the mouth fits the brush closely, sothat the individual glass fibers are well supported against each otherand against the edge of the mouthpiece.

WVhon c-rasing with the eraser, it may be held like a; pencil, andpreferably nearly normal to thcsurfucc from which erasure is being madd.This allows the protruding brush end to wear nearly evenly; but forerasing with the small point only or along a fine line, the edges orcorners of the protruding brush tip may be employed, as Will beapparent.

lVeclaim and desire to secure the following:

1. An eraser comprising a guide barrel having a screw-threaded cap atits rear end and externally screw-threaded at its fore end, an angularmouthpiece screwed onto said externally threaded end, all sides of thesaid angular mouthpiece converging toward its axis, an erasing brush inthe said guide barrel and adapted to fit the mouth of the saidmouthpiece, a cap surrounding the rear end of the barrel and prm idedwith a screw rod threaded through the said screwthreaded cap and actingagainst the said erasing brusln 2. An eraser comprising an erasingbrush, a converging mouth-piece, and means for adjusting the brushrelatively to the mouthpiece and in which the mouth is of angular form,all sides of the said mouth converging piece whereby the brush projectsin compressed and angularaform in cross section.

In testimony whereof we have signed this specification in the presenceof two subscribing witnesses June 29, 1910.

FRANCIS HENRY BALDlVlN. \VILLIAM GRAFF. lVi tncsses FRANCIS A. STANTON,E. P. LA GAY.

